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David L. Ryan/Globe Staff

Gray seals littered the beach on Cape Cod's Monomoy National Wildlife Refuge on Thursday, one of the most popular spots in New England for the mammals to enjoy the spring sun. The most recent count showed more than 15,000 seals off the coast of the region.

Can you guess how many seals are in the above photo? You can also check out more of Globe photographer David Ryan's photos from the refuge here.